<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <h1 v-if="isShow">表达式的值为真，就能显示</h1>
    <h1 v-else>v-if不成立的时候，才会显示</h1>
</div>
<script type="text/javascript">
    var vm = new Vue({
        el: '#app',
        data: {
            isShow: false
        }
    });
</script>

</body>
</html>